Omachi, Nagano, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
March Air Quality Analysis
Omachi, Nagano, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (8th March):
On this day, AQI across the 4 years varied significantly: 2026 ranks 2nd highest AQI at 43 of Good air quality, showing improvement over 2023 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 7th Mar - 8th Mar 2026
Omachi, Nagano, Japan
6 AM7th Mar 2026
5 PM
5 AM8th Mar 2026
51AQI
17AQI
62AQI
23AQI
In the last 24 hours,
Omachi's AQI reached its highest point of 62 at 4 AM during the Night, while the lowest point, 17, was recorded at 3 PM during the Day between 7th Mar and 8th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Omachi, Nagano, Japan
-5°C-7/-4°C
-9°C-13/-7°C
-9°C-14/-2°C
-4°C-13/6°C
-1°C-6/2°C
-7°C-13/0°C
-4°C-9/4°C
-1°C-7/9°C
2°C-4/11°C
0°C-4/1°C
-2°C-6/3°C
-3°C-9/4°C
-8°C-16/-1°C
-5°C-12/5°C
-1°C-8/8°C
2°C-5/12°C
3°C-2/9°C
2°C-4/11°C
5°C1/8°C
5°C-1/13°C
6°C0/12°C
4°C-4/6°C
1°C-6/10°C
2°C-4/10°C
2°C0/4°C
-1°C-9/1°C
-4°C-12/3°C
2°C-6/11°C
0°C-5/2°C
-6°C-12/1°C
54AQI
29AQI
44AQI
28AQI
2026 Days Vs Air Quality
Omachi, Nagano, Japan
94%
63
6%
4
Total number of days with different AQI categories in last 68 days in 2026 (297 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2026, 94% of 68 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Omachi, Nagano, Japan
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
19AQI (US)
16AQI (US)
20AQI (US)
25AQI (US)
32AQI (US)
22AQI (US)
23AQI (US)
30AQI (US)
24AQI (US)
26AQI (US)
21AQI (US)
21AQI (US)
31AQI (US)
16AQI (US)
37AQI (US)
48AQI (US)
45AQI (US)
24AQI (US)
46AQI (US)
28AQI (US)
15AQI (US)
21AQI (US)
35AQI (US)
37AQI (US)
41AQI (US)
21AQI (US)
34AQI (US)
27AQI (US)
26AQI (US)
36AQI (US)
42AQI (US)
32AQI (US)
36AQI (US)
29AQI (US)
37AQI (US)
41AQI (US)
36AQI (US)
22AQI (US)
12AQI (US)
33AQI (US)
38AQI (US)
46AQI (US)
38AQI (US)
41AQI (US)
58AQI (US)
57AQI (US)
42AQI (US)
19AQI (US)
29AQI (US)
13AQI (US)
25AQI (US)
45AQI (US)
35AQI (US)
41AQI (US)
40AQI (US)
33AQI (US)
24AQI (US)
29AQI (US)
14AQI (US)
30AQI (US)
62AQI (US)
36AQI (US)
41AQI (US)
51AQI (US)
42AQI (US)
36AQI (US)
43AQI (US)
29AQI (US)
34AQI (US)
43AQI (US)
No. of days
202632AQI (US)
Highest AQI (US) recorded in
March43AQI (US)
Lowest AQI (US) recorded in
January29AQI (US)
202541AQI (US)
Highest AQI (US) recorded in
July48AQI (US)
Lowest AQI (US) recorded in
January32AQI (US)
202435AQI (US)
Highest AQI (US) recorded in
March44AQI (US)
Lowest AQI (US) recorded in
December27AQI (US)
202341AQI (US)
Highest AQI (US) recorded in
July49AQI (US)
Lowest AQI (US) recorded in
September31AQI (US)
202239AQI (US)
Highest AQI (US) recorded in
May50AQI (US)
Lowest AQI (US) recorded in
August17AQI (US)
202133AQI (US)
Highest AQI (US) recorded in
June54AQI (US)
Lowest AQI (US) recorded in
January16AQI (US)
202021AQI (US)
Highest AQI (US) recorded in
August49AQI (US)
Lowest AQI (US) recorded in
May7AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Omachi's annual 2026 AQI (US) (32) shows an average percentage change of -1.2% (improved AQI (US)) compared to previous years: 2020 (21), 2021 (33), 2022 (39), 2023 (41), 2024 (35), 2025 (41).